<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
  margin: 0;
  padding: 0;
}

li {
  list-style-type: none;
}

.tab {
  width: 978px;
  margin: 20px auto;
}

.tab_list {
  height: 39px;
  border: 1px solid #ccc;
  background-color: #f1f1f1;
}

.tab_list li {
  float: left;
  height: 39px;
  line-height: 39px;
  padding: 0 20px;
  text-align: center;
  cursor: pointer;
}

.tab_list .current {
  background-color: #c81623;
  color: #fff;
}

.item_info {
  padding: 20px 0 0 20px;
}

.item {
  display: none;
}
    </style>
</head>
<body>
    <div class="tab">
        <div class="tab_list">
            <ul>
                <li class="current">商品介绍</li>
                <li>规格与包装</li>
                <li>售后保障</li>
                <li>商品评价</li>
                <li>手机社区</li>
            </ul>
        </div>
        <div class="tab_con">
        <div class="item" style="display: block;">商品介绍模板内容</div>
        <div class="item" style="display: none;">规格与包装模块内容</div>
        <div class="item" style="display: none;">售后保障模块内容</div>
        <div class="item" style="display: none;">商品评价模块内容</div>
        <div class="item" style="display: none;">手机社区模块内容</div>
        </div>
    </div>
    <script>
        var list = document.querySelectorAll("li")
        var items = document.querySelectorAll(".item")
        for (var i = 0;i<list.length;i++){
            list[i].setAttribute("index",i)
            list[i].onclick=gaibian
        }
        function gaibian(){
            //改变页签状态
            for (var i=0;i<list.length;i++){
                list[i].className = ""
            }
            this.className = "current"
            //显示合适内容
            for (var i=0;i<items.length;i++){
                items[i].style.display="none"
            }
            var index = this.getAttribute("index")
            items[index].style.display="block"
        }
    </script>
</body>
</html>